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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > LED Drivers

Infineon Technologies BCR401WE6327HTSA1

Name: BCR401WE6327HTSA1
Brand: Infineon Technologies
SKU: BCR401WE6327HTSA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCR401WE6327HTSA1

Manufacturer:: Infineon Technologies

Category:: LED Drivers

Package:: SC-82A, SOT-343

Datasheet:: BCR401WE6327HTSA1.pdf

Description:: IC LED DRVR LIN 60MA SOT343-3D

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Product details

Overview

BCR401WE6327HTSA1 from Infineon Technologies is a linear constant-current LED driver IC in SOT343-3D package, designed for low-power LED biasing with factory-preset 10 mA output (adjustable up to 60 mA via external R_ext), 1.2 V minimum headroom, and -0.3 %/K negative thermal coefficient for LED lifetime extension. It operates from 3.5 V to 18 V supply and supports parallel configuration for higher current in signage, automotive CHMSL, and medical lighting.

For engineers reviewing the BCR401WE6327HTSA1 datasheet, BCR401WE6327HTSA1 pinout, BCR401WE6327HTSA1 application, or BCR401WE6327HTSA1 equivalent, key selection criteria include its fixed/adjustable current capability, thermal derating behavior, SOT343 footprint compatibility, and AEC-Q101 qualification for automotive rear lighting systems.

Technical Context

The BCR401W implements a precision bandgap-referenced current sink with internal voltage reference and feedback amplifier, delivering stable output current independent of supply voltage variation (±0.5% over 3.5–18 V) and LED forward voltage spread. Its thermal foldback is implemented via integrated temperature-sensing circuitry that reduces I_OUT at rate of −0.3 %/K above 25 °C.

It requires no external compensation and functions as a two-terminal current source when R_ext is omitted (10 mA default), or as a three-terminal adjustable sink when R_ext is connected between VS and Rext pins. Dimming is supported via PWM control of an external NPN transistor at GND.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	10 mA (factory preset); adjustable 10–60 mA via external R_ext - enables flexible LED string design without recalculating series resistors.
Supply Voltage Range	3.5 V to 18 V - supports direct connection to 12 V automotive rails and 5 V logic supplies without LDO pre-regulation.
Minimum Headroom (V_drop)	1.2 V at I_OUT = 10 mA - allows operation with short LED strings (e.g., 2× white LEDs @ 3.8 V) while maintaining regulation.
Thermal Coefficient	−0.3 %/K - actively reduces output current as junction temperature rises, extending LED lifetime in enclosed fixtures.
Power Dissipation	500 mW max (T_S = 25 °C) - enables continuous operation in SOT343 without heatsink in ambient ≤ 60 °C.
Qualification	AEC-Q101 qualified - validated for automotive rear lighting including CHMSL and combination lamps per stress test requirements.

Pinout & Package

SOT343-3D (4-pin, 1.6 × 1.6 × 0.95 mm) surface-mount package with exposed thermal pad; JEDEC-compliant footprint and tape-and-reel packaging (E6327 designation indicates 3,000-unit reel).

Pin/Terminal	Circuit Role	Design Meaning
1: GND	Ground reference and PWM dimming control node	Low-impedance return path; accepts external NPN base drive for digital dimming without modifying IOUT path.
2: IOUT	Current sink output terminal	Connects directly to cathode of LED string; sinks regulated current regardless of VF variation across LEDs.
3: VS	Positive supply input	Accepts 3.5–18 V; internal regulator derives bias from this rail - no separate VCC required.
4: Rext	External current-setting resistor connection	When tied to VS via resistor, sets IOUT = 10 mA × (1 + 10 kΩ / R_ext); open-circuit defaults to 10 mA.

Key Features

Feature	Design Value
Factory-trimmed 10 mA current	Eliminates need for calibration resistors in cost-sensitive applications like channel letters and appliance lighting.
Adjustable current up to 60 mA	Enables single BOM part to support multiple LED configurations (e.g., 1–6 LEDs in series) via R_ext change only.
Negative thermal coefficient (−0.3 %/K)	Reduces IOUT by ~15% at T_J = 125 °C vs. 25 °C - prevents thermal runaway and extends LED L70 life by >2× in sealed enclosures.
Parallel operation support	Multiple BCR401W units can be paralleled with matched R_ext to scale current linearly (e.g., 4× units → 240 mA) without current-sharing resistors.

Applications

Channel Letter Signage

Automotive CHMSL

Use Scenario: Illuminating acrylic or metal channel letters in outdoor advertising cabinets with ambient temperatures ranging −40 °C to +85 °C.

IC Role / Device Role / Timing Role: Constant-current sink regulating 10–20 mA per LED segment, compensating for VF drift across LED batches and long PCB traces.

Use Value: Ensures uniform brightness across all letters despite supply voltage drop over 2-meter wiring runs and eliminates manual resistor sorting.

Use Scenario: Driving red LEDs in center high-mounted stop lamps on passenger vehicles, operating continuously during braking events.

IC Role / Device Role / Timing Role: AEC-Q101-qualified current regulator providing stable 20 mA per LED string under 12 V battery fluctuations (9–16 V) and thermal cycling.

Use Value: Meets ECE R7 and SAE J595 photometric stability requirements over full temperature range without derating or forced air cooling.

Refrigerator Interior Lighting

Medical Examination Lamps

Use Scenario: Powering white LED arrays inside domestic refrigerators where condensation, low temperature (−5 °C), and frequent on/off cycles occur.

IC Role / Device Role / Timing Role: Low-headroom (1.2 V) current source enabling use of 2-LED strings directly from 5 V SMPS rail without efficiency loss.

Use Value: Maintains consistent lumen output across temperature swings and avoids cold-start current surge that degrades LED phosphor layer.

Use Scenario: Biasing high-CRI white LEDs in portable diagnostic lamps requiring flicker-free, stable illumination during clinical procedures.

IC Role / Device Role / Timing Role: Precision current sink with <±2% initial accuracy and <±5% total variation over life - critical for color rendering consistency.

Use Value: Eliminates visible brightness variation between adjacent LEDs in multi-source arrays, supporting ISO 8596 visual acuity testing compliance.

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED current regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AL8805W50-7 (Diodes Inc.)	Switching buck LED driver; 500 kHz switching frequency; requires inductor and diode; 90% efficiency vs. BCR401W's 65% at 12 V/20 mA.	Used where input voltage exceeds 18 V or thermal budget is tight; unsuitable for ultra-low-noise medical lighting due to EMI.	Select when efficiency >85% is mandatory and board space allows passive components; avoid if EMI sensitivity or simplicity is priority.
NSI45020AT1G (onsemi)	Two-terminal linear LED driver; fixed 20 mA; no Rext pin; 1.4 V headroom; ±5% current tolerance vs. BCR401W's ±2%.	Targeted at high-volume indicator lighting; lacks thermal foldback and AEC-Q101 qualification.	Choose for non-automotive, cost-driven indicators where 20 mA fixed current suffices and thermal management is passive-only.

Compared with AL8805W50-7 and NSI45020AT1G, the BCR401WE6327HTSA1 uniquely balances AEC-Q101 compliance, adjustable current, thermal foldback, and SOT343 integration - making it optimal for automotive CHMSL and medical lighting where reliability, regulation accuracy, and thermal safety are jointly critical.

Availability

BCR401WE6327HTSA1 is available at Aetrix Electronics and suitable for channel letter signage, automotive CHMSL systems, and medical examination lamps requiring stable component supply, RoHS-compliant packaging, and AEC-Q101 validation.

Supply support for BCR401WE6327HTSA1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, automotive electronics, and industrial control ICs, with global manufacturing and quality certification to ISO/TS 16949.

The BCR401W belongs to Infineon's LED Linear Driver family, engineered specifically for cost-sensitive, thermally constrained LED biasing in automotive exterior lighting and industrial signage where precision, qualification, and small footprint are essential.

FAQ

Can BCR401WE6327HTSA1 drive more than one LED in series?

Yes - it supports up to 4 white LEDs (VF ≈ 3.8 V each) in series when supplied with ≥16.4 V (4 × 3.8 V + 1.2 V headroom). The datasheet confirms stable regulation with 2-LED (7.6 V) and 3-LED (11.4 V) strings at 12 V supply. Exceeding maximum V_S = 18 V risks internal overvoltage failure.

What is the maximum allowable junction temperature for continuous operation?

The absolute maximum junction temperature is 150 °C, but continuous operation above 125 °C reduces output current by −0.3 %/K and accelerates parametric drift. Derating curves in Figure 3-1 show 500 mW dissipation is only permissible at T_S ≤ 25 °C; at T_S = 60 °C, max P_tot drops to 320 mW.

How does dimming work with the GND pin?

Dimming is implemented by inserting an NPN transistor between GND and system ground, with base driven by PWM signal. When the transistor is off, current ceases; when on, full I_OUT flows. Figure 4-1 shows this configuration, and the datasheet specifies <1 µs turn-off delay - sufficient for 1 kHz PWM without visible flicker.

Is Rext required for basic operation?

No - Rext is optional. Leaving Pin 4 (Rext) unconnected configures the device for factory-trimmed 10 mA output. Adding Rext between Pin 4 and Pin 3 (VS) scales current upward: I_OUT = 10 mA × (1 + 10 kΩ / R_ext). For example, R_ext = 10 kΩ yields 20 mA; R_ext = 2.5 kΩ yields 50 mA.

BCR401WE6327HTSA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: SC-82A, SOT-343

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Linear

Topology:: -

Internal Switch(s):: Yes

Number of Outputs:: 1

Voltage - Supply (Min):: 1.2V

Voltage - Supply (Max):: 18V

Voltage - Output:: 18V

Current - Output / Channel:: 60mA

Frequency:: -

Dimming:: -

Applications:: Lighting

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PG-SOT343-3D

BCR401WE6327HTSA1 FAQ

1.How can I place an order for BCR401WE6327HTSA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BCR401WE6327HTSA1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for BCR401WE6327HTSA1 reliable?

The price and inventory of BCR401WE6327HTSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCR401WE6327HTSA1 is usually 5 days.

3.What payment methods are accepted for BCR401WE6327HTSA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCR401WE6327HTSA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCR401WE6327HTSA1?

BCR401WE6327HTSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCR401WE6327HTSA1 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for BCR401WE6327HTSA1?

For technical support, including BCR401WE6327HTSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCR401WE6327HTSA1 requirements.

6.How does Aetrix verify that BCR401WE6327HTSA1 is sourced from the original manufacturer or authorized distributors?

All BCR401WE6327HTSA1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BCR401WE6327HTSA1 meets industry standards.

7.What is the process for return or replacement of BCR401WE6327HTSA1?

All BCR401WE6327HTSA1 units undergo pre-shipment inspection (PSI). If there is an issue with BCR401WE6327HTSA1, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The BCR401WE6327HTSA1 part is unused and in its original packaging.

Return procedure for BCR401WE6327HTSA1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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